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Xalpatlahuac, nestled within the state of Guerrero, Mexico, occupies a geographically significant position within the Sierra Madre del Sur mountain range. Located at approximately 17.3333° latitude and -98.6500° longitude, the municipality’s terrain is characterized by steep slopes and valleys, resulting in a considerable elevation range. This rugged topography significantly influences local air circulation patterns. The surrounding landscape is dominated by dense cloud forests and agricultural lands, primarily dedicated to coffee and maize cultivation, contributing to both natural and anthropogenic sources of particulate matter. Xalpatlahuac sits within a transitional zone between the humid coastal lowlands and the higher-elevation temperate zones, experiencing a complex interplay of climatic influences. While not directly adjacent to major bodies of water, the region receives substantial rainfall, contributing to high humidity levels. The urban character of Xalpatlahuac is distinctly rural, with a small population of 12,615, and limited industrial activity. The nearest significant industrial belts are located further north, towards the coastal regions of Guerrero. The urban–rural gradient is gradual, with agricultural activities seamlessly blending into the surrounding forested areas. This proximity to agricultural lands means that seasonal burning practices, common for land clearing and crop residue management, can significantly impact local air quality, particularly during the dry season. The mountainous terrain often traps pollutants, exacerbating localized air quality issues and limiting dispersion.

Xalpatlahuac’s air quality experiences a distinct seasonal cycle dictated by its tropical climate and mountainous geography. The dry season, typically spanning from March to May, often witnesses a noticeable increase in particulate matter. This is largely attributable to agricultural burning practices employed to prepare fields for planting, combined with reduced rainfall that limits the natural cleansing effect of precipitation. Temperature inversions, common during these months, trap pollutants within the valleys, further degrading air quality. The wet season, from June to October, brings frequent rainfall and increased humidity, naturally flushing the atmosphere and significantly improving air quality. However, periods of intense rainfall can also lead to soil erosion and the suspension of fine particulate matter, temporarily impacting visibility. November and February represent transitional periods, with fluctuating weather patterns. Fog, particularly prevalent during the cooler mornings, can trap pollutants and reduce air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting strenuous outdoor activities during peak burning periods. During the wet season, while generally cleaner, individuals with allergies should be mindful of pollen levels. The interplay of wind patterns, often channeled through the mountain passes, can also influence pollutant dispersion, creating localized areas of poor air quality even during periods of overall improvement. Understanding these seasonal variations is crucial for mitigating potential health risks and promoting responsible land management practices.